Grease-gun.



W. FREEMAN.

GREASE GUN.

APPLICATION FILED JULY 19, 1913.

Patented Feb. 9, 1915.

2 SHEETS-SHEET 1.

INVEN T01? W W. FREEMAN.

GREASE GUN.

APPLICATION II LED JULY 19, 1913.

Patented Feb. 9, I915.

m H L 5 1 w$k .MJ 1 w W WOOD FREEMAN, OF SEATTLE, WASHINGTON.

GREASE-GUN.

Specification of Letters Patent.

Patented Feb. 9. 1915.

Application filed July 19, 1913. Serial-No. 780,093.

To all whom it may concern:

Be it known that I, VVooD FREEMAN, a citizen of the United States, residing at Seattle, in the county of King and State ofl/Vashington, have invented certain new and useful Improvements in Grease-Guns,

of which the following is a specification.

The object of my invention is to provide a grease gun which shall be easily and quickly filled and emptied either with liquid or solid grease without the common annoyance of getting the grease on,'the hands. Also to provide a gun that shall be compact and simple to operate and which shall not require the separating of the parts from each other to fill or empty.

The mechanism of the gun isfully de scribed as follows and is shown in the accompanying drawings.

Figure 1 shows a side elevation of the grease gun as normally used. Fig. 2 shows acentral longitudinal section of the outer cylinder with a side elevation'of the inner cylinder showing the piston pulled back and the pin in the slot, but not in the recess. It also shows the elongated slot in the side of the inner tube. Fig. 3 shows the gun with the nozzle unclasped, and

.the inner tube pushed out ready to be plunged into the grease. Fig. L shows a detail of the pin and bayonet slot together with the slot in the inner tube, shown also in Figs. 2 and 3. Fig. 5 is a longitudinal central section of the piston and upper end of the inner tube. Fig. 6 shows a detail of the slot and recess and pin through a section taken on the line 66 of Fig. 4. Fig. 7 shows a section of the gun taken on a line 7-7 in Fig. 4. Fig. 8 shows a force drive for use on the larger guns to push the piston home. Fig. 9 shows the slot of the piston rod and the rack inserted on which the small pinion works.

Similar numcrils refer to similar parts throughout the several views.

1 is the outer cylinder or barrel of the gun and 2 is the inner cylinder which works easily but closely in the outer barrel, the inner barrel havinga part-of its side cut away the entire length forming the slot 11 the edges of which are sharpened as shown Fig. 7 to permit the piston leathers 9, 9 to fit tightly against the outer barrel.

At the upper end of the inner cylinder is the diskS which forms a head for the same and in which is the recess 4"and the slot 4. The pin 5 on the piston rod 6 cooperates with the recess to push the inner cylinder out of the outer cylinder. On the piston rod is a disk 7 shown in Fig. 5 located under the head of the inner cylin- .der and serves to draw the inner cylinder back into the outer cylinder after the inner cylinder has been loaded with grease. The disk is held on the piston rod by a sleeve 8 which in turn is held in place by the piston proper. The piston is made up of three metal washers 9 and two leather washers 9, 9 the latter being cupped in opposite directions so as to suck and expel grease without leakage.

The piston rod has a stop formed by the handle 10 which prevents the inner cylin der from being pushed entirely out of the outer cylinder. The slot 11 in the inner cylinder allows the inner cylinder to be forced its entire length into the pail of grease and allows the grease to fill com pletely to the head of the inner cylinder. By a slight rotation of the piston or barrel a cylinder full of grease is cut out which may be withdrawn into the outer cylinder.

Atthe lower end of the outer cylinder is a cap 12 hinged at one side and provided -with a clasp 1-1 at the other, arranged to fit over a cam provided at the lower end of the outer cylinder opposite the hinge. Secured to the cap is the nozzle 13.

In case of larger guns or'with heavy grease it is sometimes needful to have an easy method of forcing the piston home. Such a device is shown in Fig. 8 which is a simple rack and pinion the rack being made separate and inserted in a slot in the piston rod and the small pinion working in the rack in the piston rod and driven by the crank on the side. The pinion and crank are both fastened on a journal of sufficient length to allow the crank to swing freely without touching the side of the gun. The journal passes through a boxing which can be slid back and forth in a horizontal slot by means of a cam as shown, and thus the pinion may be made to engage or disengage the rack at will.

To operate the gun clasp the barrel of the gun with the left hand and the piston rod handle in the right and pull the piston up as far as possible, then turn thehandle to the right keeping it pulled back as far as possible until the pin drops in the'slot 4; then turning it still farther to the fight place the pin in the recess by which means the inner tube may be pushed out of the outer cylinder. Then unclasp .the nozzle or hinged cap and swing it back out of the way. Push the piston downward which will also push the inner tube out of the outer tube. Plunge the inner tube down in the pail of grease as far as the bottom of the outer tube. Now give the piston a slight turn to the right by which movement the grease is cut out from the pail of grease and the inner tube may now be drawn back into the outer cylinder. Give the lower end of the gun a wipe across the edge of the pail which will free it from adhering grease. Fasten the cap tightly by means of the cam clasp over the end of the gun, turn the piston quickly to the left which disengages the pin from the recess and allows the piston to be pushed home by which means the grease is expelled.

This grease gun is self-contained in that the parts are never dismantled for charging and the inner cylinder or charging member is extruded outwardly and withdrawn into the outer cylinder through the instrumentality of the piston rod on the opening of the closure or hinge cap 12 which carries nozzle 13. The fact that the outer cylinder becomes a handle for the scoop member or inner charging cylinder when the device is used to scoop up the grease renders the device cleanly and precludes the possibility of mixing with the grease any dirt, grit or other material foreign to grease and extremely detrimental to those machine parts where the grease is used. feature, the gun is extremely easy to fill and requj res from one-third to one-fifth the time consumed with an other gun; the time varying with the specific gravity of the grease handled.

. Various changes may be made in the form, proportions and details of the device without departing from the spirit of my invention since I do not consider myself limited to the precise details shown in the draw-- ings, but am entitled to all variations thereof as may fall within the scope of the claims.

Having thus described my invention, I claim 1. In a grease gun, an.outer cylinder, an inner cylinder slidably mounted in the outer cylinder, a piston in the inner cylinder, a

piston rod for said piston and means for interlocking the piston rod and inner cylinder whereby the innercylinder may be pushed out of the outer one.

2. In a grease gun an outer cylinder and an inner cylinder, said inner cylinder being concentrically and slidably mounted within the former and a piston rod working within sa d inner cylinder and a disk carried by said )PlStOIl rod to draw back the inner tube By the use of this scoop' Wllipn same has been pushed out of the outer tu e.

3. In a grease gu'l an outer cylinder-and an inner cylinder being concentrically and slidably mounted within the former, said inner cylinder having a closure provided with a recess and a piston rod provided with a pin adapted to be seated in said recess.

4. In a grease gun an outer cylinder and an inner cylinder, said inner cylinder being concentrically and slidably mounted within the former and having a closure at one end provided with a slot and a recess and a piston rod moving freely within said cylinder and a pin on the piston rod adapted to pass through the slot and also adapted to be seated in the recess.

5. In a grease gun an outer cylinder and an inner cylinder, said inner cylinder being concentrically and slidably mounted within the former, av piston rod mounted within said inner cylinder carrying a pin for pushing said inner cylinder out of the outer cyl inder, also carrying a disk for drawing said inner cylinder back into the outer cylinder, said piston rod also provided with a stop which prevents said inner cylinder from being pushed entirely out of said outer cylinder.

6. In a grease gun, two cylinders, mounted concentrically and slidably, each normally provided at one of its ends with a closure having an opening, the closures being at. corresponding ends of the cylinders and the openings being alined, means passing freely through said openings, said means being also provided with devices arranged to engage the inner cylinder to move the s me in and out of the outer cylinder.

7. An outer cylinder provided with an aperture-d closure at one end, an inner cylinder provided with an apertured closure, and slidahly mounted in the outer cylinder with the closures normally in proximity to each other, a. piston slidably mounted in the inner cylinder, operating means for the piston extending through the apertured closures. and cooperating interlocking means mounted on the operating means and the inner cylinder, whereby the inner cylinder may he moved in .and out of the outer cylinder.

ton extending 'tl'irough the apertured closures. and cooperating interlocking means mounted on the operating means and the inner cylinder, whereby the inner cylinder may be forced out of the outer cylinder.

9. An outer cylinder, provided with an apertured closure, at one end, an inner cylinder provided with an apertured closure, and slidably mounted in the outer cylinder with the closures normally in proximity to each other, a piston slidably mounted in the inner cylinder, operating means for the piston extending through the apertured closures, and cooperating interlocking means mounted on the operating means and the inner cylinder, whereby the inner cylinder may be drawn back into the outer cylinder when said inner cylinder has been forced out of said outer cylinder.

10. A grease gun consisting of an outer cylinder, a piston rod working therethrough, a charging member connectible with and disconnectible from the piston rod and adapted to be extruded through the instrumentality of the rod beyond the hollow cylinder and to be withdrawn thereinto, means for fretaining the charging member in the hollow cylinder, and a piston on the piston rod operable on the contents of the charging member.

11. A grease gun comprising in combination a cylinder having a closure at one end provided with a nozzle, a piston rod working through the opposite end and a charging member constructed and arranged to be extruded beyond the cylinder to be charged when said closure is open, and withdraw able intothe cylinder through the instrumentality of the piston rod, and a piston by which the cdntents of the charging member may be discharged through the nozzle.

12. A grease gun consisting of an outer cylinder having a closure at one end provided with a nozzle, a piston rod working through the opposite end and a longitudinally slotted inner cylinder open at the end toward the nozzle, means connecting the slotted cylinder and piston rod to eXtrude the inner cylinder outwardly when said closure is open and a piston carried by the piston rod and working in the inner cylinder to project the contents of the latter through the nozzle.

13. A grease gun comprising in combination an outer cylinder, a piston rod Working at all times through one end of the cylilider and a charging member engageable and disengageable by the piston rod and designed when engaged with the piston rod to be extruded from the opposite end of the cylinder and to be withdrawn thereinto, means for locking the charging member within the outer cylinder, and a piston by which the contents of the charging member may be projected when the piston is disconnected from the charging member.

14. In a grease gun the combination of an outer cylinder provided with a removable nozzle, a sliding cylinder in the outer cylinder provided with a lon itudinal slot, :1 piston in the slotted cylinder, a piston rod connected thereto and operative from outside the outer cylinder, means whereby through the instrumentality of the piston rod the slotted cylinder may (a) be reciprocated (b) may be given a turning movement in the outer cylinder and independent of the latter, and (0) the piston may be reciprocated independent of the slotted cylinder.

15. In a grease gun the combination of an outer cylinder having a removable nozzle at one end, a piston rod working through the other end of the outer cylinder, a sliding slotted cylinder, a piston in the slotted cylinder, a piston rod working through an end of the slotted cylinder and connected with the piston, means for connecting and disconnecting the piston rod and cylinder, whereby when connected the piston rod and cylinder will reciprocate in unison and when disconnected the piston can be reciprocated in the slotted cylinder.

In testimony whereof I affix my signature in presence of two witnesses.

WOOD FREEMA-N.

W'itnesses Mrs. CORNELIUS CABoT, NEAL CABo'r. 

